Table of Contents
Advertisement
3. PROTECTION ERROR
No display or No Sound.
3-1. D(DC) PROTECTION
3-1-1. Solution
Replace AMP board.
3-1-2. How to troubleshoot (Countermeasure)
1) Check DC Voltage of speaker out FL+/-, TWL+/- (CN704 pin1, 2, 3, 4), FR +/-, TWR+/- (CN703 pin1, 2,
4, 5), and C+/-(CN702 pin1, 2).
2) Check resistor crack, cold solder of PWM IC out (AR606, AR607, AR605).
3) If PWM IC out is ok and speaker out (FL+/-, FR+/-, TWL+/-, TWR+/-, C+/-) has DC voltage,
replace AMP board.
3-1-3. Service hint (Any picture / Remark)
CN702
CN702
AR607, AR606, AR605
AR607, AR606, AR605
ONE POINT REPAIR GUIDE
CN703
CN703
< AMP board top view >
3-12
Copyright © 2019 LG Electronics Inc. All rights reserved.
CN704
CN704
Only for training and service purposes.
Hide quick links:
Advertisement
Chapters
Table of Contents
